mod. weird; terrible. : There was an unearthly smell coming out of the kitchen.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
unearthly
1611, "heavenly, sublime," from un- (1) "not" + earthly (see earth). Sense of "ghostly, weird" first recorded 1802.